Configurable folder excludes

packages/langium-vscode/package.json

@@ -37,7 +37,17 @@
         "fileMatch": "langium-config.json",
         "url": "./data/langium-config-schema.json"
       }
-    ]
+    ],
+    "configuration": {
+      "title": "Langium",
+      "properties": {
+        "langium.build.ignorePatterns": {
+          "type": "string",
+          "default": "node_modules, out",
+          "description": "Specifies the exclusion patterns during initial workspace indexing. You will need to reload your extension afterwards."
+        }
+      }
+    }
   },
   "activationEvents": [
     "onLanguage:langium"
@@ -55,7 +65,8 @@
   "dependencies": {
     "langium": "0.4.0",
     "vscode-languageclient": "^8.0.1",
-    "vscode-languageserver": "^8.0.1"
+    "vscode-languageserver": "^8.0.1",
+    "ignore":"~5.2.0"
   },
   "devDependencies": {
     "@types/vscode": "^1.53.0",

packages/langium-vscode/src/extension.ts

@@ -34,41 +34,40 @@ function startLanguageClient(context: vscode.ExtensionContext): LanguageClient {
     // If the extension is launched in debug mode then the debug server options are used
     // Otherwise the run options are used
     const serverOptions: ServerOptions = {
-      run: { module: serverModule, transport: TransportKind.ipc },
-      debug: {
-        module: serverModule,
-        transport: TransportKind.ipc,
-        options: debugOptions
-      }
+        run: { module: serverModule, transport: TransportKind.ipc },
+        debug: {
+            module: serverModule,
+            transport: TransportKind.ipc,
+            options: debugOptions
+        }
     };
 
     const fileSystemWatcher = vscode.workspace.createFileSystemWatcher('**/*.langium');
     context.subscriptions.push(fileSystemWatcher);
 
     // Options to control the language client
     const clientOptions: LanguageClientOptions = {
-      // Register the server for langium documents
-      documentSelector: [{ scheme: 'file', language: 'langium' }],
-      synchronize: {
-        // Notify the server about file changes to langium files contained in the workspace
-        fileEvents: fileSystemWatcher
-      }
+        // Register the server for langium documents
+        documentSelector: [{ scheme: 'file', language: 'langium' }],
+        synchronize: {
+            // Notify the server about file changes to langium files contained in the workspace
+            fileEvents: fileSystemWatcher
+        }
     };
 
     // Create the language client and start the client.
     const client = new LanguageClient(
-      'langium',
-      'Langium',
-      serverOptions,
-      clientOptions
+        'langium',
+        'Langium',
+        serverOptions,
+        clientOptions
     );
 
     // Start the client. This will also launch the server
     client.start();
     return client;
 }
 
-
 // TODO(@@dd): externalize extension config
 const DELAY = 100; // delay in ms until a render can be cancelled on subsequent document changes
 
@@ -93,7 +92,7 @@ type CancelableDecorator = () => void;
 type TimeoutID = ReturnType<typeof setTimeout>; // NodeJS.Timer (node) or number (browser)
 
 // adds the ability to cancel decoration requests
-function cancelableDecorator(decorator: Decorator, delay: number = 500): CancelableDecorator {
+function cancelableDecorator(decorator: Decorator, _delay = 500): CancelableDecorator {
     let timeout: TimeoutID | undefined; // works for window.setTimeout() & NodeJS
     return () => {
         const editor = vscode.window.activeTextEditor;
@@ -137,7 +136,7 @@ function decorateText(document: vscode.TextDocument, decorations: vscode.Decorat
     }
 }
 
- // TODO(@@dd): find bug
+// TODO(@@dd): find bug
 function findIndentation(text: string): number {
     const indents = text.split(/[\r?\n]/g).map(line => line.trimRight()).filter(line => line.length > 0).map(line => line.search(/\S|$/));
     const min = indents.length === 0 ? 0 : Math.min(...indents); // min(...[]) = min() = Infinity
@@ -146,7 +145,7 @@ function findIndentation(text: string): number {
 
 function isSmartTemplate(name: string, index: number): boolean {
     // TODO(@@dd): check if symbol(name)'s type resolves to smart template
-    return name === "indent" && index !== -1;
+    return name === 'indent' && index !== -1;
 }
 
 // styling of a decorated range

packages/langium-vscode/src/language-server/grammar-workspace-manager.ts

@@ -0,0 +1,53 @@
+/******************************************************************************
+ * Copyright 2022 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+
+import ignore, { Ignore } from 'ignore';
+import { LangiumGrammarLanguageMetaData } from 'langium/src/grammar/generated/module';
+import { LangiumSharedServices } from 'langium/src/services';
+import { ConfigurationProvider } from 'langium/src/workspace/configuration';
+import { FileSystemNode } from 'langium/src/workspace/file-system-provider';
+import { DefaultWorkspaceManager } from 'langium/src/workspace/workspace-manager';
+import * as path from 'path';
+import { CancellationToken, WorkspaceFolder } from 'vscode-languageserver-protocol';
+import { URI, Utils } from 'vscode-uri';
+
+const CONFIG_KEY = 'build';
+
+interface WorkspaceManagerConf {
+    /**
+     * gitignore-style exclusion patterns, separated by comma
+     */
+    ignorePatterns: string
+}
+
+export class LangiumGrammarWorkspaceManager extends DefaultWorkspaceManager {
+
+    protected readonly configurationProvider: ConfigurationProvider;
+    protected matcher: Ignore | undefined;
+
+    constructor(services: LangiumSharedServices) {
+        super(services);
+        this.configurationProvider = services.workspace.ConfigurationProvider;
+    }
+
+    async initializeWorkspace(folders: WorkspaceFolder[], cancelToken = CancellationToken.None): Promise<void> {
+        const buildConf: WorkspaceManagerConf = await this.configurationProvider.getConfiguration(LangiumGrammarLanguageMetaData.languageId, CONFIG_KEY);
+        const ignorePatterns = buildConf.ignorePatterns?.split(',')?.map(pattern => pattern.trim())?.filter(pattern => pattern.length > 0);
+        this.matcher = ignorePatterns ? ignore().add(ignorePatterns) : undefined;
+        return super.initializeWorkspace(folders, cancelToken);
+    }
+
+    protected includeEntry(workspaceFolder: WorkspaceFolder, entry: FileSystemNode, fileExtensions: string[]): boolean {
+        if (this.matcher) {
+            // create path relative to workspace folder root: /user/foo/workspace/entry.txt -> entry.txt
+            const relPath = path.relative(URI.parse(workspaceFolder.uri).path, entry.uri.path);
+            const ignored = this.matcher.ignores(relPath);
+            return !ignored && (entry.isDirectory || (entry.isFile && fileExtensions.includes(Utils.extname(entry.uri))));
+        }
+        return super.includeEntry(workspaceFolder, entry, fileExtensions);
+    }
+
+}

packages/langium-vscode/src/language-server/main.ts

@@ -4,10 +4,18 @@
  * terms of the MIT License, which is available in the project root.
  ******************************************************************************/
 
-import { createLangiumGrammarServices, startLanguageServer } from 'langium';
+import { createLangiumGrammarServices, LangiumSharedServices, Module, PartialLangiumSharedServices, startLanguageServer } from 'langium';
 import { NodeFileSystem } from 'langium/node';
 import { createConnection, ProposedFeatures } from 'vscode-languageserver/node';
+import { LangiumGrammarWorkspaceManager } from './grammar-workspace-manager';
 
 const connection = createConnection(ProposedFeatures.all);
-const { shared } = createLangiumGrammarServices({ connection, ...NodeFileSystem });
+
+export const LangiumGrammarSharedModule: Module<LangiumSharedServices, PartialLangiumSharedServices> = {
+    workspace: {
+        WorkspaceManager: (services) => new LangiumGrammarWorkspaceManager(services)
+    }
+};
+
+const { shared } = createLangiumGrammarServices({ connection, ...NodeFileSystem }, LangiumGrammarSharedModule);
 startLanguageServer(shared);

packages/langium/src/default-module.ts

@@ -33,6 +33,7 @@ import { DefaultDocumentValidator } from './validation/document-validator';
 import { ValidationRegistry } from './validation/validation-registry';
 import { DefaultAstNodeDescriptionProvider, DefaultReferenceDescriptionProvider } from './workspace/ast-descriptions';
 import { DefaultAstNodeLocator } from './workspace/ast-node-locator';
+import { DefaultConfigurationProvider } from './workspace/configuration';
 import { DefaultDocumentBuilder } from './workspace/document-builder';
 import { DefaultLangiumDocumentFactory, DefaultLangiumDocuments, DefaultTextDocumentFactory } from './workspace/documents';
 import { FileSystemProvider } from './workspace/file-system-provider';
@@ -132,7 +133,8 @@ export function createDefaultSharedModule(context: DefaultSharedModuleContext):
             IndexManager: (services) => new DefaultIndexManager(services),
             WorkspaceManager: (services) => new DefaultWorkspaceManager(services),
             FileSystemProvider: (services) => context.fileSystemProvider(services),
-            MutexLock: () => new MutexLock()
+            MutexLock: () => new MutexLock(),
+            ConfigurationProvider: (services) => new DefaultConfigurationProvider(services)
         }
     };
 }

packages/langium/src/grammar/langium-grammar-module.ts

@@ -6,16 +6,16 @@
 
 import { createDefaultModule, createDefaultSharedModule, DefaultSharedModuleContext } from '../default-module';
 import { inject, Module } from '../dependency-injection';
-import { LangiumServices, LangiumSharedServices, PartialLangiumServices } from '../services';
+import { LangiumServices, LangiumSharedServices, PartialLangiumServices, PartialLangiumSharedServices } from '../services';
 import { LangiumGrammarGeneratedModule, LangiumGrammarGeneratedSharedModule } from './generated/module';
-import { LangiumGrammarCodeActionProvider } from './lsp/grammar-code-actions';
 import { LangiumGrammarScopeComputation, LangiumGrammarScopeProvider } from './langium-grammar-scope';
-import { LangiumGrammarSemanticTokenProvider } from './lsp/grammar-semantic-tokens';
 import { LangiumGrammarValidationRegistry, LangiumGrammarValidator } from './langium-grammar-validator';
+import { LangiumGrammarCodeActionProvider } from './lsp/grammar-code-actions';
 import { LangiumGrammarFoldingRangeProvider } from './lsp/grammar-folding-ranges';
 import { LangiumGrammarFormatter } from './lsp/grammar-formatter';
-import { LangiumGrammarReferences } from './references/grammar-references';
+import { LangiumGrammarSemanticTokenProvider } from './lsp/grammar-semantic-tokens';
 import { LangiumGrammarNameProvider } from './references/grammar-naming';
+import { LangiumGrammarReferences } from './references/grammar-references';
 import { LangiumGrammarGoToResolver } from './lsp/grammar-goto';
 
 export type LangiumGrammarAddedServices = {
@@ -46,13 +46,15 @@ export const LangiumGrammarModule: Module<LangiumGrammarServices, PartialLangium
     }
 };
 
-export function createLangiumGrammarServices(context: DefaultSharedModuleContext): {
-    shared: LangiumSharedServices,
-    grammar: LangiumGrammarServices
-} {
+export function createLangiumGrammarServices(context: DefaultSharedModuleContext,
+    sharedModule?: Module<LangiumSharedServices, PartialLangiumSharedServices>): {
+        shared: LangiumSharedServices,
+        grammar: LangiumGrammarServices
+    } {
     const shared = inject(
         createDefaultSharedModule(context),
-        LangiumGrammarGeneratedSharedModule
+        LangiumGrammarGeneratedSharedModule,
+        sharedModule
     );
     const grammar = inject(
         createDefaultModule({ shared }),

packages/langium/src/index.ts

@@ -45,3 +45,4 @@ export * from './workspace/documents';
 export * from './workspace/index-manager';
 export * from './workspace/file-system-provider';
 export * from './workspace/workspace-manager';
+export * from './workspace/configuration';

packages/langium/src/lsp/language-server.ts

@@ -135,6 +135,7 @@ export function startLanguageServer(services: LangiumSharedServices): void {
     addSemanticTokenHandler(connection, services);
     addExecuteCommandHandler(connection, services);
     addSignatureHelpHandler(connection, services);
+    addConfigurationChangeHandler(connection, services);
 
     connection.onInitialize(params => {
         return services.lsp.LanguageServer.initialize(params);
@@ -315,6 +316,13 @@ export function addSemanticTokenHandler(connection: Connection, services: Langiu
         services
     ));
 }
+export function addConfigurationChangeHandler(connection: Connection, services: LangiumSharedServices): void {
+    connection.onDidChangeConfiguration(change => {
+        if (change.settings) {
+            services.workspace.ConfigurationProvider.updateConfiguration(change);
+        }
+    });
+}
 
 export function addExecuteCommandHandler(connection: Connection, services: LangiumSharedServices): void {
     const commandHandler = services.lsp.ExecuteCommandHandler;

packages/langium/src/services.ts

@@ -39,6 +39,7 @@ import type { DocumentValidator } from './validation/document-validator';
 import type { ValidationRegistry } from './validation/validation-registry';
 import type { AstNodeDescriptionProvider, ReferenceDescriptionProvider } from './workspace/ast-descriptions';
 import type { AstNodeLocator } from './workspace/ast-node-locator';
+import { ConfigurationProvider } from './workspace/configuration';
 import type { DocumentBuilder } from './workspace/document-builder';
 import type { LangiumDocumentFactory, LangiumDocuments, TextDocumentFactory } from './workspace/documents';
 import type { FileSystemProvider } from './workspace/file-system-provider';
@@ -151,6 +152,7 @@ export type LangiumDefaultSharedServices = {
         WorkspaceManager: WorkspaceManager
         FileSystemProvider: FileSystemProvider
         MutexLock: MutexLock
+        ConfigurationProvider: ConfigurationProvider
     }
 }